FREQuency Subsystem
Parameter
Typical Return
1 μHz to maximum instrument frequency, except for triangle and ramp, which are
limited to 200 kHz. Default default 550 Hz
+1.00000000003
Set sweep center frequency to 1 kHz:
FREQ:CENT 1000
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The following equation shows how center frequency is limited by span frequency.
Center Frequency (max) = Max. Frequency for waveform - (Span/2)
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The following equation shows how center frequency relates to start and stop frequencies.
Center Frequency = |(Stop Frequency - Start Frequency)|/2
[SOURce[1|2]:]FREQuency:COUPle[:STATe] {ON|1|OFF|0}
[SOURce[1|2]:]FREQuency:COUPle[:STATe]?
Enables/disables frequency coupling between channels in a two-channel instrument.
Parameter
Typical Return
{ON|1|OFF|0}, default OFF
0 (OFF) or 1 (ON)
Turn on the frequency couple state:
FREQ:COUP ON
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Specifying ON starts frequency coupling as specified by
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If the current offset or ratio, combined with the current frequency settings, would cause either frequency to
exceed instrument specifications, the instrument will generate an error and the exceeded frequency will clip at its
maximum or minimum value.
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If setting mode to RATIO and setting RATIO to 1.0 still exceeds the specifications of either channel (for example,
channel 1 is a 3 MHz sine and channel 2 is a ramp, which cannot go that high), an error message will be generated
and FREQuency:COUPle will be OFF.
[SOURce[1|2]:]FREQuency:COUPle:MODE {OFFSet|RATio}
[SOURce[1|2]:]FREQuency:COUPle:MODE?
Sets the type of frequency coupling between frequency coupled channels; OFFSet specifies a constant frequency offset
between channels; RATio specifies a constant ratio between the channels' frequencies.
Parameter
Typical Return
{OFFSet|RATio}, default RATio with ratio 1.0
OFF or RAT
Set frequency coupling mode to OFFSet:
FREQ:COUP:MODE OFFS
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Power-on default for frequency coupling is OFF.
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Specifying SOURce1 or SOURce2 is irrelevant; either syntax sets the same coupling mode for both channels.
Agilent 33500 Series Operating and Service Guide
203
